Abstract: A simple, light-weight device consisting of a minimal number of parts, made from injection molded polyethylene or other lightweight, inexpensive material, which fits inside a standard cardboard box of 4.00.times.2.75 inches high of varied length. The device, having two end plates (10A and 10B) which can be pulled apart or put close together, is used to protect Baseball cards, measuring 3.5.times.2.5 inches, from getting damaged when they are loosely transported or stored inside the standard cardboard box. This is accomplished when the two end plates (10A and 10B) in their extended positions are pressing on one side against the inside wall of a standard box and at the other side against a pack of cards. The holding force of the two end plates (10A and 10B) is maintained by a series of molded bubbles and recesses or notches at the inside walls of poly-ethylene parts of a main connector tube (14), which connects two end plates (10A and 10B) at the center of said plates and of said device.